本科生毕业论文“标准格式示范”

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1、扬州大学本科生毕业论文本科生毕业论文毕业论文题目学生姓名所在学院专业及班级指导教师完成日期年月日13扬州大学本科生毕业论文耐盐能源植物海滨锦葵苗期对不同盐分浓度的响应×××，农学0801班，学号：0817011××指导教师：×××教授摘要：采用有机物/土壤混合基质穴盘育苗方式进行海滨锦葵育苗试验，研究了不同盐分浓度(0、0.3%、0.6%、0.9%和1.2%)下海滨锦葵的出苗、苗的生育和生理特性。结果表明，随着盐分浓度的增加，海滨锦葵出苗率明显降低，育苗基质中的盐分浓度低于0.6%时，可以保持80%以上的出苗率；当土壤盐分浓度在0.6%以下时，移栽成活率

2、保持在65%以上，若要使得移栽成活率维持在75%以上，盐分浓度应保持在0.3%左右。随着土壤盐分浓度的增加，移栽后海滨锦葵根、茎、叶的生长发育均受到影响，主要表现为株高降低，叶片长度和宽度变小，主茎叶龄和出叶速度降低，各器官干重下降，植株根系活力减弱，叶片可溶性蛋白、SOD活性及其水平受到明显影响，游离氨基酸和脂类过氧化产物MDA积累速度大幅度上升，且光合特性受到明显影响。当苗床基质和土壤盐分浓度小于0.6%时，所受的负面影响相对较小。关键词：海滨锦葵；盐分胁迫；生长发育；生理活性TheImpactofSaltStressonSalt-tolerantB

3、io-energyPlantK.virginica(L)Presl.Abstract:Theobjectiveofthisresearchwastomakeaprobeintotheeffectsofsaltstress(0,0.3%,0.6%,0.9%and1.2%)onthegrowthandphysiologicalcharacteristicsofK.virginicaseedlingssoastoprovideasolidbaseforthefurtherresearchofseedlingbreeding.Theseedsweresownin

4、tothepotsofseedlingplasticmatrixcontainingtheculturalmixtureoforganicsubstrateandconventionalsoil.Generally,whensaltconcentrationinthemixturewaslessthan0.6%,theemergenceratewasabout80.0%.Whensaltconcentrationinthemixtureishigherthan0.6%,theemergencerateandsurvivalrateofseedlingsw

5、erehigherthan65.0%.Ifthesurvivalrateisexpectedbehigherthan75.0%,saltconcentrationinthemixtureshouldbekeptlowerthan0.3%.Afterseedtransplantation,assaltconcentrationstrengthened,thegrowthofrootandleafwasgreatlyinhibited,thelengthandwidthoftrueleaveswassignificantlysmallerthanthecon

6、trol,theleafageandfreshweightofdifferentorgansdecreasedsignificantly,andtherootactivitydecreasedaswell.Theconcentrationofsoluble13扬州大学本科生毕业论文proteinandSODactivitydecreasedsignificantly,andthefreeaminoacidconcentrationandMDAconcentrationinleavesincreasedundersaltstress,andphotosyn

7、theticcharacteristicsinleavesweresignificantlyinfluenced.Assaltconcentrationlessthan0.6%,thenegativeinfluenceonK.virginicawaslow.Keywords:Kostelezkyavirginica(L.)Presl.;saltstress;growth;physiologicalcharacteristics13扬州大学本科生毕业论文目录1.前言…………………………………………………………………………………………………32.材料与方法…

8、…………………………………………………………………………………32.1试验设计…